Originally published as Genetics Published Articles Ahead of Print on June 21, 2005.

Genetics, Vol. 171, 227-238, September 2005, Copyright © 2005
doi:10.1534/genetics.105.042051

A Genetic Linkage Map for the Tiger Pufferfish, Takifugu rubripes

* Fisheries Laboratory, The University of Tokyo, Maisaka, Shizuoka 431-0214, Japan, {dagger} National Research Institute of Aquaculture, Fisheries Research Agency, Tamaki, Mie 519-0423, Japan, {ddagger} Institute of Molecular and Cell Biology, Singapore 138673, Republic of Singapore and § Nagasaki Prefectural Institute of Fisheries, Taira, Nagasaki 851-2213, Japan

2 Corresponding author: Fisheries Laboratory, The University of Tokyo, 2971-4 Maisaka, Shizuoka 431-0214, Japan.
E-mail: akikuchi{at}mail.ecc.u-tokyo.ac.jp

The compact genome of the tiger pufferfish, Takifugu rubripes (fugu), has been sequenced to the "draft" level and annotated to identify all the genes. However, the assembly of the draft genome sequence is highly fragmented due to the lack of a genetic or a physical map. To determine the long-range linkage relationship of the sequences, we have constructed the first genetic linkage map for fugu. The maps for the male and female spanning 697.1 and 1213.5 cM, respectively, were arranged into 22 linkage groups by markers heterozygous in both parents. The resulting map consists of 200 microsatellite loci physically linked to genome sequences spanning ~39 Mb in total. Comparisons of the genome maps of fugu, other teleosts, and mammals suggest that syntenic relationship is more conserved in the teleost lineage than in the mammalian lineage. Map comparisons also show a pufferfish lineage-specific rearrangement of the genome resulting in colocalization of two Hox gene clusters in one linkage group. This map provides a foundation for development of a complete physical map, a basis for comparison of long-range linkage of genes with other vertebrates, and a resource for mapping loci responsible for phenotypic differences among Takifugu species.




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